There is a long tradition of elk hunting in Utah being a family affair. Not saying it is right, and will actually say it is wrong, but that doesn't change the tradition.
LE Bull elk tags are hard to get, and basically a once in a lifetime tag (maybe, maybe twice) in Utah. When anybody in the family draws a tag, everybody goes hunting with them. Some call it posse hunting. Very, very common to see 10 or more (even 20+) people out scouting, riding ATV's, using radios, etc., to contact the lucky tag holder to come shoot the best bull found. Strange to me, and not my cup of tea, but exceedingly common in Utah, where large extended families are common.
For adults, only the tag holder in the family can actually pull the trigger, legally. Don't think this is the first time that another member of the hunting party actually took the shot, however, and uncle, aunt, granny, brother, cousin, father, whomever tagged the animal, however. This practice is illegal, and called poaching by the DWR. In most all cases, there is only one tag in the family on a given year, and only one bull is shot. Still is is illegal if an adult other than the tag holder pulls the trigger, even if everybody is standing around together.
It is legal, however, for a youth to use the adults tag and become the one who pulls the trigger- completely legally. He then puts dad's, uncles, etc., tag on the critter and this is entirely legal. The tag holder does have to be present as a "mentor".
This is a terrible law, and should not have been enacted. In the story mentioned, the son who shot the bull was NOT a youth, so therefore could not legally fill his Dad's tag. If he was younger, it would have been legal. No doubt he knew it was illegal, and has been punished. It just seems like it muddies the water when youth can do this legally, but if you are one day too old it is suddenly poaching.
My vote is to eliminate this practice all together. And illegal or not, it still seems far different than the guy who poaches an elk outside the season (or two, or three), or in an area where there is no tag. Just an interesting way to confuse the situation and make it a mess for public perception.
Bill